Prusa - Original Prusa i3 MK3S/+ to MK4S upgrade kit

This is the full upgrade that also contains the MK4’s new X/Y precise motors (400 steps, 0.9°per step). It’s the most expensive of all three, but last time you voiced your interest in a full MK2->MK3 upgrade pretty strongly, so we decided to give you a full MK4 upgrade as well.

This product is supplied as a kit - you must assemble it yourself!

Important: The black injection-molded spool holder is not part of the upgrade package.

Here is a closer explanation of the difference between the MK3.9 and MK4 upgrade packages:

Here is a closer explanation of the difference between the MK3.9 and MK4 upgrade packages: the only difference is in the stepper motors. The MK4 uses higher-precision stepper motors that help eliminate VFA (Vertical Fine Artifacts) – these are tiny surface artifacts that are visible if you closely inspect a printed object. In other words, the motors in the full MK4 upgrade are the cherry on top – if you’re chasing the highest possible level of quality, they will come in handy. But the MK3.9 upgrade is very close to that.

This product includes:

• 32-bit xBuddy board (same as MK4)
• Metal xBuddy case (and cover)
• xLCD screen (same as MK4)
• Nextruder parts (including E motor)
• Cables for Nextruder, Heatbed, xLCD
• 10 mm smooth rods (Z-axis)
• X/Y/Z motors
• Expansion joints for Heatbed
• New belts for X & Y axes
• Fasteners and other accessories
• PCCF printed parts
• Injection molded parts (PG cover and xLCD cover)
• WI-FI module
• NFC module
• High-Performance 360° Cooling Fan and Fan shroud
• High-flow Prusa CHT nozzle - 0.4 mm
  

Parts kept from your MK3S/MK3S+

• Frame and extrusions (new MK4 has just a different look)*
• PSU** (same wattage/voltage as MK4)
• Heatbed MK52 24V (thermistor and power cables will be changed) *
• X/Y rods and bearings
  

*Frame and heatbed are not included upgrade, because replacing these parts brings no functional advantage and would only increase the price of the upgrade.

**Please note that silver PSU will require a cable adapter.